import java.io.*;
import java.util.*;
import java.util.stream.*;
import java.math.*;

class Process {
    private int[] S;

    Process(int[] S) {
        this.S = S;
    }

    BigDecimal getResult() {
        int max = IntStream.of(S).max().getAsInt();
        int min = IntStream.of(S).min().getAsInt();

        int sum = IntStream.of(S).sum() - max - min;

        return ((new BigDecimal(sum)).divide( (new BigDecimal(S.length - 2)), 2, RoundingMode.HALF_UP));
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        int[] input = Stream.of(bufferedReader.readLine().trim().split("[ ]+")).mapToInt(Integer::parseInt).toArray();

        // 処理および出力
        printWriter.println((new Process(input)).getResult());
        
        bufferedReader.close();
        printWriter.close();
    }
}